Transmission Internal Mode Switch Replacement for GMC Truck Sierra - 4WD 2008

Important: The Internal Mode Switch (IMS) is mounted to the manual shift shaft detent lever as an assembly. The components of the detent lever/IMS assembly cannot be individually serviced. When the IMS needs replacing, the entire assembly must be replaced.

Replace the IMS. Refer to Manual Shift Shaft, Detent Lever, and Position Switch Assembly Replacement .